Abstract
The paper presents geochronological data on silicate and endogenic carbonate rocks from the Oshurkovo apatite-bearing pluton, namely, the U-Pb and Rb-Sr isochron ages of gabbros and carbonatites. The U-Pb age of the carbonatites from this pluton (126.55 ± 0.85 Ma) is close to that of the other carbonatite occurrences in southwestern Transbaikalia. Also, its similarity to the age of the gabbro (125.4 ± 2 Ma), which makes up the bulk of the pluton, suggests that these rocks are comagmatic.
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